package com.nowcoder.community.controller;

import com.google.code.kaptcha.Producer;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.exception.KaptchaNotMatchException;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.RedisKeyUtil;
import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.http.Cookie;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.web.WebAttributes;
import org.springframework.security.web.authentication.session.SessionAuthenticationException;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author szq
 * @create 2023-01-19 21:47
 * @description 登录注册控制器
 */
@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * @return 跳转到注册界面
     */
    @GetMapping("/register")
    public String getRegisterPage() {
        return "/site/register";
    }

    /**
     * @return 跳转到登录界面
     */
    @GetMapping("/login")
    public String getLoginPage(HttpSession session, Model model) {
        Object obj = session.getAttribute(WebAttributes.AUTHENTICATION_EXCEPTION);
        if (obj != null) {
            if (obj instanceof KaptchaNotMatchException) {
                KaptchaNotMatchException kaptchaNotMatchException = (KaptchaNotMatchException) obj;
                model.addAttribute("codeMsg", kaptchaNotMatchException.getMessage());
            }
            if (obj instanceof UsernameNotFoundException) {
                UsernameNotFoundException usernameNotFoundException = (UsernameNotFoundException) obj;
                model.addAttribute("usernameMsg", usernameNotFoundException.getMessage());
            }
            if (obj instanceof BadCredentialsException) {
                BadCredentialsException badCredentialsException = (BadCredentialsException) obj;
                model.addAttribute("passwordMsg", badCredentialsException.getMessage());
            }
            if (obj instanceof SessionAuthenticationException) {
                SessionAuthenticationException sessionAuthenticationException = (SessionAuthenticationException) obj;
                model.addAttribute("sessionMsg", sessionAuthenticationException.getMessage());
            }
        }
        model.addAttribute("username", session.getAttribute("username"));
        model.addAttribute("password", session.getAttribute("password"));
        session.removeAttribute("username");
        session.removeAttribute("password");
        session.removeAttribute(WebAttributes.AUTHENTICATION_EXCEPTION);
        return "/site/login";
    }

    /**
     * 注册功能
     *
     * @param model 模型
     * @param user  接收用户信息
     * @return 成功跳到激活码操作界面，失败跳转回注册界面
     */
    @PostMapping("/register")
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);
        // 注册成功
        if (map == null || map.isEmpty()) {
            model.addAttribute("msg", "注册成功，我们已经向您的邮箱发送了一封激活邮件，请尽快激活！");
            model.addAttribute("target", "/index");
            return "/site/operate-result";
        } else {    // 注册失败
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }
    }

    /**
     * 用于处理激活请求
     *
     * @param model  模型
     * @param userId 用户Id
     * @param code   激活码
     * @return 跳转到激活界面
     */
    //http://localhost:8080/community/activation/101/code激活链接
    //http://localhost/activation/175/e3ac0f14ddac473fac5cc2b8a4b6b471
    @GetMapping("/activation/{userId}/{code}")
    public String activation(Model model, @PathVariable int userId, @PathVariable String code) {
        int result = userService.activation(userId, code);
        if (result == ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功，您的账号已经可以正常使用了！");
            model.addAttribute("target", "/login");
        } else if (result == ACTIVATION_REPEAT) {
            model.addAttribute("msg", "无效操作，该账号已经激活过了！");
            model.addAttribute("target", "/index");
        } else {
            model.addAttribute("msg", "激活失败，您提供的激活码不正确！");
            model.addAttribute("target", "/index");
        }
        return "/site/operate-result";
    }

    /**
     * 获取验证码
     *
     * @param response 响应
     */
    @GetMapping("/kaptcha")
    public void getKaptcha(HttpServletResponse response/*, HttpSession session*/) {
        // 生成验证码
        String text = kaptchaProducer.createText();
        BufferedImage image = kaptchaProducer.createImage(text);

        // 将验证码存入 session
        //session.setAttribute("kaptcha", text);

        // 验证码归属（存入Redis,使用随机字符串区分用户）
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60);   // 1min
        cookie.setPath(contextPath);
        response.addCookie(cookie);

        // 将验证码存入 Redis
        String redisKey = RedisKeyUtil.getKaptcha(kaptchaOwner);
        redisTemplate.opsForValue().set(redisKey, text, 60, TimeUnit.SECONDS);

        // 将图片输出给浏览器
        response.setContentType("image/png");
        try {
            ServletOutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);
        } catch (IOException e) {
            logger.error("响应验证码失败：" + e.getMessage());
        }
    }

    //@PostMapping("/login")
    //注意username,password这些没有封装进model
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, HttpServletResponse response,
                        @CookieValue("kaptchaOwner") String kaptchaOwner/*,HttpSession session*/) {
        // 判断验证码是否正确
        //String kaptcha = (String) session.getAttribute("kaptcha");
        String kaptcha = null;
        if (StringUtils.isNotBlank(kaptchaOwner)) {
            String redisKey = RedisKeyUtil.getKaptcha(kaptchaOwner);
            kaptcha = redisTemplate.opsForValue().get(redisKey).toString();
        }

        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确!");
            return "/site/login";
        }
        // 检查账号和密码
        int expiredSecond = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSecond);
        // 校验成功
        if (map.containsKey("ticket")) {
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSecond);
            response.addCookie(cookie);
            return "redirect:/index";
            // 校验失败
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    /*@GetMapping("/logout")
    public String logout(@CookieValue("ticket") String ticket){
        userService.logout(ticket);
        SecurityContextHolder.clearContext();
        return "redirect:/login";
    }*/
}
